Cisco Systems AS5800 manuale d’uso

Voice over IP for the Cisco AS5800 1 V oice o v er IP f or the Cisco AS5800 The V oice ov er IP for the Cisco AS5800 feature adds V oice over IP carrier-class gate way functionality to the Cisco AS5800 platform. This document contains the following sections: • Feature Overvie w , page 1 • Supported Platforms, page 5 • Supported Standards, MIB[...]

Feature Overview 2 Cisco IOS Release 12.0(7)T Benefits T wo-Stage-Dial T oll Bypass W ith V oice over IP on the Cisco AS5800, you can leverage your network’ s W AN infrastructure to of fer long dist ance toll bypass services. T oll bypa ss occurs in two stages. F or example, customers can be assigned an account number and a Personal Identif icati[...]

Benefits Voice over IP for the Cisco AS5800 3 Figure 1 T wo-Stage Dial T oll Bypa ss PSTN V oice-T raffic and F ax-T raffic Off load Carriers can lev erage their W AN infrastructure to off load v oice and fax traf f ic from their congested PSTN networks by using the Cisco AS5800 as a carri er class voice g ateway . In this application, PSTN traff i[...]

Feature Overview 4 Cisco IOS Release 12.0(7)T Figure 2 V oIP Used as a PSTN Gatewa y to Off load V oice T raffic and Fax T raffic Univ ersally Accessib le V oice-Mail and F ax-Mail Serv ices V oIP on the Cisco AS580 0 can be used to leverage the technology prefix es feature. Gateways (with voice/f ax feature cards) that are connect ed to the voice-[...]

Supported Platforms Voice over IP for the Cisco AS5800 5 • V oice, V ideo, and Ho me Applications Command Refer ence , Cisco IOS Release 12.0 • Quality of Service Configuration Guide , Cisco IOS Release 12.0 • Quality of Service Command Reference , Cisco IOS Release 12.0 • V oice o ver IP for the Cisco AS5800 Software Conf iguration Guide ,[...]

Prerequisites 6 Cisco IOS Release 12.0(7)T Prerequisites Before you can configure your Cisco AS5800 to use V oice over IP , you must first: • Install a version of the Cisco IOS software that supports DSPW are 3.1.7 specific to the Cisco AS5800 (for example, Cisco IOS Release 12 .0(4)XL or Ci sco IOS Release 12.0(7)T). • Establish a working IP n[...]

Configuration Tasks Voice over IP for the Cisco AS5800 7 • Integrate your dial plan and telephony network into your existing IP network topology . Merging your IP and telephony networks depends on y our particular IP and telephony network topology . In general, we recommend the following suggestions: — Use canonical numbers where ver possible. [...]

Configuration Tasks 8 Cisco IOS Release 12.0(7)T same operations; the QoS tasks they perform might also differ . T o configure your IP network for real-time voice traf fic, you need to consider the func tions of both edge and backbone ro uters in your network, then select the appropriate QoS tool or tools. In general, edge routers perform the follo[...]

Configuring Voi ce Ports Voice over IP for the Cisco AS5800 9 T o configure basic ISDN parameters for V oice ov er IP on t he Cisco AS5800, perform the following steps: As mentioned, under most circumstances, the defa ult voice-port command v a lues are adequate to configure v oice ports to transport voice data over y our existing IP network. If yo[...]

Configuration Tasks 10 Cisco IOS Release 12.0(7)T Fine-T uning ISDN V oice P or ts Depending on the specifics of your particular ne twork, you may need to adjust voice parameters in volving timing, input gain, and output attenu ation for voice ports. Collecti vely , these commands are referred to as v oi ce-port tuning commands. Note In most cases,[...]

Configuring Voi ce Ports Voice over IP for the Cisco AS5800 11 For more information on specif ic voice-port configuration comm ands or additional voice-port commands, refer to either th e Cisco IOS Release 12.0(3)T V oice over IP for the Cisco AS5300 feature module or the Cisco IOS Release 12.0 V oice, V ideo, and Home Applications Command Refer en[...]

Configuration Tasks 12 Cisco IOS Release 12.0(7)T Configuring Dial P eers The key point to understanding ho w V oIP func tions is to understand dial peers. Each dial peer defines the characteristics associat ed with a call leg, as sho wn in Figure 3 and Figure 4. A call leg is a discrete se gment of a call connec tion that li es between two points [...]

Configuring Dial Peers Voice over IP for the Cisco AS5800 13 PO TS peers associate a telep hone number with a par ticular voice port so that incoming calls for that telephone number can be recei ved and outgoing calls can be pl aced. V oIP peers point to specif ic devices (b y associating destin ation telephone numb er s with a specific IP address)[...]

Configuration Tasks 14 Cisco IOS Release 12.0(7)T prefix, “9, ” to the front of the r emaining numbers, so that the actual numbers dialed is “9, 2222. ” The comma in this example means that the router wil l pause for one s econd between dialing the “9” and the “2” to allo w for a secondary dial tone. Direct Inward Dial f or PO TS P [...]

Configuring Dial Peers Voice over IP for the Cisco AS5800 15 Using the elements, the algorithm is as follows: For all peers where call type (VoIP versus POTS) match dial peer type: if the type is matched, associate the called number with the incoming called-number else if the type is matched, associate calling-number with answer-address else if the[...]

Configuration Tasks 16 Cisco IOS Release 12.0(7)T Configuring V oIP P eers V oIP peers enable outgoing calls to be made from a particul ar telephony device. T o configure a V oIP peer , you need to uniquely identify the peer (by assigning it a unique tag number), define its destination telephone number and destin ation IP address. As with PO TS pee[...]

Configuring the Cisco AS5800 as an H.323 Gateway Voice over IP for the Cisco AS5800 17 • Use the show dial plan number command on the local and remote r outers to verify that the data is conf igured correctly on both. • If you have conf igured number expansion, use th e show num-exp command to check that the partial number on the local ro uter [...]

Configuration Tasks 18 Cisco IOS Release 12.0(7)T V er ifying Gate wa y Interf ace Configuration Use the show gateway command to find the current re gistration info rmation and status of the gateway . Configuring the Cisco AS5800 f or Interactive V oice Response The Interacti ve V oice Response (IVR) Service Provid er application provides IVR capab[...]

Configur ation Example Voice over IP for the Cisco AS5800 19 For more information about configuring IVR, refer to the Ci sco IOS Release 12.0(7)T Config uring Interactive V oice Response for Cisco Access Platforms feature module. V er ifying IVR Configuration • If you hav e relatively fe w dial peers configured, you can use the show dial-peer voi[...]

Configuration Example 20 Cisco IOS Release 12.0(7)T Configuring the Cisco 3640 as a Gatekeeper ! Configure the Ethernet interface to be used at the gatekeeper interface. interface Ethernet0/1 ip address 172.30.00.00 255.255.255.0 no ip directed-broadcast no logging event link-status no keepalive ! ! Configure the gatekeeper interface and enable the[...]

Command Reference Voice over IP for the Cisco AS5800 21 ! dial-peer voice 12345 voip destination-pattern 12345 tech-prefix 6# session target ras ! ! Enable gateway functionality. gateway ! ! Enable Cisco Express Forwarding. ip cef ! ! Configure and enable the gateway interface. interface FastEthernet0/3/0 ip address 173.60.0.0.255.255.255.0 no ip d[...]

Command Reference 22 Cisco IOS Release 12.0(7)T Modified Commands • codec • port • show csm • show voice port • voice-port In Cisco IOS Release 12.0(1)T or later , you can search and filter the output for show and more commands. This functionali ty is useful when you need to sort through large amounts of output, or if you want to exclude [...]

codec Voice over IP for the Cisco AS5800 23 codec T o specify the voice coder rate of speech for a dial peer , use the codec dial-peer configuration command. T o restore the default voice coder rate of speech v alue, use the no form of this command. codec { g711alaw | g711ul aw | g723r53 | g723r63 | g726 r16 | g726r24 | g726r32 | g728 | g729abr8 | [...]

Command Reference 24 Cisco IOS Release 12.0(7)T Command History Usage Guidelines For toll quality , us e the g711alaw or g711ulaw values. These v alues pr ovide high-quality voice transmission but use a signif icant amount of bandwidth. For almost toll quality (and a significant savings in bandwidth), use the g7 29r8 va l ue . If codec values for t[...]

dtmf-relay Voice over IP for the Cisco AS5800 25 dtmf-rela y T o specify how an H.323 gateway relays dual tone multifrequency (DTMF) tones betw een telephony interfaces and an IP network, use the dtmf-relay dial-peer configuration command. T o remov e all signaling options and transmit the DTMF to nes as part of the audio stream, use the no form of[...]

Command Reference 26 Cisco IOS Release 12.0(7)T The principal advantage of the dtmf-r elay command is that it transmits DTMF tones with greater fidelity than is possible in-band for most lo w-bandwidth CODECs, such as G.729 and G.723. W ithout the use of DTMF relay , calls establis hed with low-bandwidth CODECs may hav e trouble accessing automated[...]

port Voice over IP for the Cisco AS5800 27 por t T o associate a dial peer with a specific v o ice port, use the port dial peer conf iguration command. T o cancel this association, use the no form of this command. Cisco 2600/3600 Series Router port slot/subunit/port no port Cisco MC3810 port slot/port no port Cisco AS5300 Access Ser v er port contr[...]

Command Reference 28 Cisco IOS Release 12.0(7)T Command Mode Dial-peer configuration Command History Usage Guidelines This command is used for calls incoming from a telephony interface to select an incoming dial peer and for calls coming from the V oIP network to match a port with the selected outgoin g dial peer . This command applies only to PO T[...]

show csm Voice over IP for the Cisco AS5800 29 show csm T o display the call switchi ng module (CSM) statistics for a particular or all DSP channels or for a specific modem or DSP channel, use the show csm pri v ileged EXEC command. Cisco AS5300 Access Ser v er show csm { modem [ slot / port | modem-group-number ] | voice [ slot / dspm / dsp / dsp-[...]

Command Reference 30 Cisco IOS Release 12.0(7)T Use the show csm mode m command to display the CSM call st atistic information for a specific modem, for a group of modems, or for all modems. If a slot/port argument is specif ied, then CSM call statistics are displayed for the specified modem. If the modem-gr oup-number argument is specified, the CS[...]

show csm Voice over IP for the Cisco AS5800 31 The following is sample output from the Cisco AS5800 for the show csm voice command : 5800# show csm voice 1/8/19 shelf 1, slot 8, port 19 VDEV_INFO:slot 8, port 19 vdev_status(0x00000401):VDEV_STATUS_ACTIVE_CALL.VDEV_STATUS_HASLOCK. csm_state(0x00000406)=CSM_OC6_CONNECTED, csm_event_proc=0x60868B8C, c[...]

Command Reference 32 Cisco IOS Release 12.0(7)T dev ice_status The status of the device. Possible v alues are: — VDEV_ST A TUS_UNLOCKED—Device is unlocked (meaning that it is av ailable for ne w calls). — VDEV_ST A TUS_A CTIVE_WDT—Device is al located for a call and the watchdog timer is set to time the connection response from the central [...]

show csm Voice over IP for the Cisco AS5800 33 csm_state CSM call state of the current call (PRI line) associated with this device. Possible val ues are: — CSM_IDLE_ST A TE—De vice is idle. — CSM_IC_ST A TE—A device has been assigned to an incoming call. — CSM_IC1_COLLECT_ADDR_INFO—A de vice has been selected to perform ANI/DNIS address[...]

Command Reference 34 Cisco IOS Release 12.0(7)T wait_for_bchan: Indicates wh ether this (outgoing) call is waiting for a B channel to send the call out on. pri_chnl= Indicates which type of TDM stream is used for the PRI connection. For PRI and CAS calls, it will always be T DM_PRI_STREAM. tdm_chnl= Indicates which type of TDM stream is used for th[...]

show csm Voice over IP for the Cisco AS5800 35 Related Commands Command Description show call ac tive voice Displays the V oice o ver IP a ctiv e call table. show call history voice Displays the V oice over IP call history table. show num-exp Displays how the number expansions are conf igured in V oice o ver IP . show voice por t Displays configura[...]

Command Reference 36 Cisco IOS Release 12.0(7)T show v oice por t T o display configuration informatio n about a specific v oice port, use the show voice port pri vileged EXEC command. Cisco 2600/3600 Series Router show voice port slot-number / subunit-number / port Cisco MC3810 show voice port [ slot / port ] [ summary ] Cisco AS5300 Access Router[...]

show voice port Voice over IP for the Cisco AS5800 37 F or the Cisco MC3810: F or the Cisco AS5300 Access Server : F or the Cisco AS5800 Univ ersal Access Ser v er : Command Mode Privileged EXEC slot / port (Optional) D isplays information fo r only the voice port you specify with the slot/port designation. The slot va ri a b l e specifies the slot[...]

Command Reference 38 Cisco IOS Release 12.0(7)T Command History Usage Guidelines This command applies to V oice ov er IP , V oice o ver Frame Relay , V oice over A TM, and V oice over HDLC. Use the show voice port privileged EXEC command to displa y configuration and v oice interface card-specific information about a specific port. Examples The fol[...]

show voice port Voice over IP for the Cisco AS5800 39 Wink Duration Timing is set to 0 ms Delay Start Timing is set to 0 ms Delay Duration Timing is set to 0 ms The follo wing is sample output from the show voice port command for an FXS v oice port on the Cisco 3600 series: router# show voice port 1/0/0 Foreign Exchange Station 1/0/0 Slot is 1, Sub[...]

Command Reference 40 Cisco IOS Release 12.0(7)T Voice Activity Detection is disabled Ringing Time Out is 180 s Wait Release Time Out is 30 s Nominal Playout Delay is 80 milliseconds Maximum Playout Delay is 160 milliseconds Analog Info Follows: Region Tone is set for northamerica Currently processing Voice Maintenance Mode Set to None (not in mtc m[...]

show voice port Voice over IP for the Cisco AS5800 41 Currently Processing T ype of call currentl y being processed: none, v oice, or fax. Delay Duration T iming Maximum delay signa l duration for dela y dial signaling. Delay Start T iming T iming of generation of dela yed start signal from detection of incoming seizure. Description Description of [...]

Command Reference 42 Cisco IOS Release 12.0(7)T The following is sample output from the Cisco AS5800 for the show voice port command: 5800# show voice port 1/0/0:D ISDN 1/0/0:D Type of VoicePort is ISDN Operation State is DORMANT Administrative State is UP No Interface Down Failure Description is "" Noise Regeneration is enabled Non Linea[...]

show voice port Voice over IP for the Cisco AS5800 43 Related Commands Operations State Opera tion state of the port. Operation T ype Operation of the E& M signal: two-wire or four-wire. Noise Regeneration Whether or not background noise should be played to f ill silent gaps if V AD is acti vated. Non-Linear Processing Whether or not non-li nea[...]

Command Reference 44 Cisco IOS Release 12.0(7)T show vrm active_calls T o display activ e-only voice calls either for a specif ic VFC or all VFCs, use the show vrm active_calls privile g ed EXEC command . show vrm activ e_calls { dial-shelf-slot-n umber | all } Syntax Description Def aults No default behavior or v al ues. Command Modes Privileged E[...]

show vrm active_calls Voice over IP for the Cisco AS5800 45 slot = 6 virtual voice dev (tag) = 40 channel id = 2 capabilities list map = 9FFF last/current codec loaded/used = None TDM timeslot = 157 Resource (vdev_common) status = 401 means :active others T able 4 explains the fields in the sample output. T able 4 show vrm vde vice Field Des cripti[...]

Command Reference 46 Cisco IOS Release 12.0(7)T Related Commands tot egress co ntrol T otal number of control packet s sent from the V oIP side of the connection to the PSTN side of the connection. tot egress data drops T otal number of data packet s dropped from the V oIP side of the connection to the PSTN side of the connection. tot egress contro[...]

show vrm vdevices Voice over IP for the Cisco AS5800 47 show vrm vde vices T o display detailed information for a specific DSP or a brief summary display for all VFCs, use the show vrm vde vices privile ged EXEC command. show vrm vde vices {{ vfc-slot-number | voice-device-number } | su mmary } Syntax Description Def aults No default behavior or v [...]

Command Reference 48 Cisco IOS Release 12.0(7)T Examples The following is sample output from the show vrm vdevice command specifying dial shelf slot number and DSP number . In this particul ar example, the call is acti ve so the statistics displayed are for this acti ve call. If no calls are currently ac ti v e on the device, the statistics would b[...]

show vrm vdevices Voice over IP for the Cisco AS5800 49 capability list ma p Bitmaps for the codec s upported on that DSP channel. A vailable v alues are: • CC_CAP_CODEC_G711U: 0x1 • CC_CAP_CODEC_G711A: 0x2 • CC_CAP_CODEC_G729IETF: 0x4 • CC_CAP_CODEC_G729a: 0x8 • CC_CAP_CODEC_G726r16: 0x10 • CC_CAP_CODEC_G726r24: 0x20 • CC_CAP_CODEC_G[...]

Command Reference 50 Cisco IOS Release 12.0(7)T The follo wing is sample ou tput from the show vrm devices command specifying a summary list. In the V oice Device Mapping area, the C_Ac column indicates number of acti ve calls for a specif ic DSP . If there are any non zero numbers under th e C_Rst and/or C_Bad column, this indicat es a reset reque[...]

show vrm vdevices Voice over IP for the Cisco AS5800 51 <information deleted> +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 91 16 1 2 0 0 0 92 16 2 2 0 0 0 93 16 3 1 0 0 0 94 16 4 2 0 0 0 95 16 5 2 0 0 0 96 16 6 2 0 0 0 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Total active call channels = 178 Total busied out [...]

Command Reference 52 Cisco IOS Release 12.0(7)T core type T ype of DSPware in us e: Possible f ield val ues are: • 1 = boot loader • 2 = high complexity core • 3 = medium comple xity core • 4 = lo w complexity core trough size This v alue indirectly represents the complexity of the DSPware in use. slop val ue This v alue indirectly represen[...]

show vrm vdevices Voice over IP for the Cisco AS5800 53 loadable codec bitmap Represents the loadable codec bitmap for the loadable CODECs. Possible field v alues are: • CC_CAP_CODEC_G711U = 0x0001 • CC_CAP_CODEC_G711A = 0x0002 • CC_CAP_CODEC_G729IETF = 0x0004 • CC_CAP_CODEC_G729a = 0x0008 • CC_CAP_CODEC_G726r16 = 0x0010 • CC_CAP_CODEC_[...]

Command Reference 54 Cisco IOS Release 12.0(7)T Related Commands Command Description show vrm active _calls Displays acti ve-only v oice calls eithe r for a specif ic VFC or all VFCs.[...]

test vrm busyout Voice over IP for the Cisco AS5800 55 test vrm b usy out T o busyout a specif ic DSP or cha nnels on a specific DSP , use the test vrm b usyout pri vileged EXEC command. test vrm bu syout slot-number { fir st-dsp-number { last-dsp-number | {channel number } } | all Syntax Description Def aults No default behavior or v al ues. Comma[...]

Command Reference 56 Cisco IOS Release 12.0(7)T The follo wing example busied out all of the chan nels from DSP 1 to DSP3 for the VFC located in slot 4: router# test vrm busyout 4 1 3 The following e xample busies out only channel 2 of DSP1 for the VFC located in slot 4: router# test vrm busyout 4 1 channel 2 Related Commands Command Description te[...]

test vrm reset Voice over IP for the Cisco AS5800 57 test vrm reset T o reset a particular DSP , use the test vrm r eset priv ileged EXEC comma nd. test vrm r eset { slot-number dsp-numbe r } Syntax Description Def aults No default behavior or v al ues. Command Modes Privileged EXEC Command History Usage Guidelines Use the test vrm reset command to[...]

Command Reference 58 Cisco IOS Release 12.0(7)T test vrm unb usy out T o restore activity to a busied-out DSP or b usied-out channels on a DSP , use the test vrm unbusy out pri vileged EXEC command. test vrm unbusy out slot-number { fi rst-dsp-number { last-dsp-number | {channel number } } | all Syntax Description Def aults No default behavior or v[...]

test vrm un busyout Voice over IP for the Cisco AS5800 59 The follo wing example restores the acti vity of all the channels on the D SP from DSP1 to DSP3 for the VFC located in slot 4: router# test vrm unbusyout 4 1 3 The following example restores the acti vity of only chann el 2 of DSP1 for the VFC located in slot 4: router# test vrm unbusyout 4 [...]

Command Reference 60 Cisco IOS Release 12.0(7)T v oice-por t T o enter the voice-port conf iguration mode, use the voice-port global conf iguration command. Cisco 2600/3600 Series Router voice-port slot-number / subunit-number / port Cisco MC3810 voice-port [ slot / port ] [ summary ] Cisco AS5300 Access Router voice-port contr oller number :D Cisc[...]

voice-port Voice over IP for the Cisco AS5800 61 F or the Cisco AS5300 Access Server : F or the Cisco AS5800 Univ ersal Access Ser v er : Def aults No default behavior or v al ues. Command Modes Global configuration Command History Usage Guidelines Use the voice-port global configuration command to switch to the voice-port conf iguration mode from [...]

Command Reference 62 Cisco IOS Release 12.0(7)T The following e xample accesses the voice-port conf iguration mode for digital voice port 24 on a Cisco MC3810 with a D VM installed : configure terminal voice-port 1/24 The following e xample accesses the voice-port configuration mode for the Cisco AS5300: configure terminal voice-port 1:D The follow[...]

Debug Commands Voice over IP for the Cisco AS5800 63 Deb ug Commands This section documents new or modified debug commands. All other com mands used w ith this feature are documented in one of the follwing Cisco IOS documentation: • Cisco IOS Release 12.0 V oice, V ideo, and Home Application s Command Re fer ence • Cisco IOS Release 12.0 Dial S[...]

Debug Commands 64 Cisco IOS Release 12.0(7)T deb ug vrm contr ol T o display all control messages sent to and recei ved from the DSP , use the deb ug vrm control privile ged EXEC comm and. T o stop displa ying DSP-specific control messages , use the no form of this command. [ no ] debug vrm contr ol Syntax Description There are no arguments or keyw[...]

debug vrm cont rol Voice over IP for the Cisco AS5800 65 *Nov 22 19:17:51.995: content : 0 0 0 1 0 18 0 1 0 49 0 B 0 1 0 *Nov 22 19:17:54.815: SEND CONTROL slot 4 tag 1 size E *Nov 22 19:17:54.815: content : 0 0 0 1 0 A 0 1 0 53 0 1 0 0 0 *Nov 22 19:17:54.815: SEND CONTROL slot 4 tag 1 size E *Nov 22 19:17:54.815: content : 0 0 0 1 0 A 0 1 0 54 0 1[...]

Debug Commands 66 Cisco IOS Release 12.0(7)T T able 7 describ es the field s in pre vious exam ple. Related Commands T a ble 7 debug vrm control Field Descriptions Field Description tag# DSP number . len Length of the packet from the R TP header (the next two b ytes). chan Channel number (the ne xt two bytes). msg Message ID number (t he next two b[...]

debug vrm error Voice over IP for the Cisco AS5800 67 deb ug vrm err or T o display all DSP-specific error messages going to the v oice resource manager (VRM), use the debug vrm err or privile ged EXEC command . T o stop displaying DSP-specific error messages, use the no form of this command. [ no ] debug vrm err or Syntax Description There are no [...]

Debug Commands 68 Cisco IOS Release 12.0(7)T Possibe status v alues are as follows: • A CTIVE_CALL = 0x0001 • BUSY OUT_REQ = 0x0002 • B AD = 0x0004 • B A CK2BA CK_TEST = 0x0008 • RESET = 0x0010 • DO WNLOAD_FILE = 0x0020 • DO WNLOAD_F AIL = 0x0040 • SHUTDO WN = 0x0080 • BUSY = 0x0100 • OIR = 0x0200 • HASLOCK = 0x 0400 /* vdev_p[...]

debug vrm error Voice over IP for the Cisco AS5800 69 This error message sho ws that there is no buf fer le ft in the pool for the VT SP to send a message to the DSP . <Number> int his output referst o the number of times the VRM ran out of buf fer space. - vrm_vtsp_get_packet: no buffers <number> This error message notif ies the VRM of[...]

Debug Commands 70 Cisco IOS Release 12.0(7)T Related Commands Command Description debug vrm contro l Displays debug messages for all DSP- specific control messages going to the voice resource manager (VRM). debug v rm inout Displays deb ug messages for all DSP- specific messages going to and coming from the voice resource manager (VRM).[...]

debug vrm inout Voice over IP for the Cisco AS5800 71 deb ug vrm inout T o display debug messages for all DSP-specifi c messages going to and comin g from the voice resource manager (VRM), use the de bug vrm inout privile ged EXEC command. T o stop displayi ng DSP-specific messages , use the no form of this command. [ no ] debug vrm inout Syntax De[...]

Glossary 72 Cisco IOS Release 12.0(7)T Glossary AAA —Authentication, Au thorization, and Accounting. AAA is a suit e of network security services that provide the primary framework through which access control can be set up on your Cisco router or access server . AC O M —T erm used in G.165, “General Characteristic s of International T elepho[...]

Glossary Voice over IP for the Cisco AS5800 73 FIFO —First-in, first-out. In data communication, FI FO refers to a buffering scheme where the f i rst byte of data entering the buf fer is the first byte re trie ved by the CPU. In telephony , FIFO refers to a queuing scheme where the first calls receiv ed are the first calls processed. G atekeeper [...]

Glossary 74 Cisco IOS Release 12.0(7)T PBX —Pri vate Branch Exchange. Pri vat ely-owned central switching of fice. PLAR —Priv ate Line Au to Ringdown. This type of service results in a call attempt to some particular remote endpoint when the local extension is taken off-k ey . PO TS —Plain Old T elephone Service. Basic telephone service supp [...]